An image contrast enhancement method based on histogram limitation
An image contrast and histogram technology, applied in the field of image processing, can solve the problems of poor visual effect and small dynamic range of images, and achieve the effect of enhancing contrast, improving visual range and improving visual effect.
Active Publication Date: 2019-04-02
JIANGSU UNIV OF TECH
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[0003] The main purpose of the present invention is to provide an image contrast enhancement method based on histogram limitation, which solves the problem of small dynamic range and poor visual effect of the image, and has the effect of simple operation and obvious processing effect
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[0043] In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0044] Such as figure 1 As shown, the image contrast enhancement method based on histogram limitation provided in this embodiment is based on the image histogram, and the gray value is adjusted to be displayed in a specified gray range, including the following steps:
[0045] Step 1: Calculate the histogram H(i) of the grayscale image I;
[0046] Step 2: Calculate p≥p 0 the corresponding h 0 ;
[0047] Step 3: Record H(i)>h 0 The gray value of , set the stretching range;
[0048] Step 4: Find out the position of the gray value on the original image in turn, write the value in the corresponding position of the output image, and record the corresponding value; ...
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The invention discloses an image contrast enhancement method based on histogram limitation, and belongs to the technical field of image processing. The method comprises the steps of calculating a histogram H (i) of a grayscale image I; calculating h0 corresponding to p > = p0; recording the gray value of H (i) greater than h0, and setting a stretching range; sequentially finding out the positionsof the gray values on the original image, writing numerical values at the corresponding positions of the output image, and recording the corresponding numerical values; recording the gray value of H (i) < = h0, taking out the gray value, finding out the closest value, recording the position coordinates of the value, and finding out the changed value; and converting the output image into a uint8 type and outputting the uint8 type. According to the method, the global histogram processing is adopted, the image dynamic range is stretched to the maximum extent, and the contrast enhancement purposeis achieved; for a low-contrast image with a small dynamic range, an enhanced image effect is particularly obvious, a certain defogging effect is achieved on a foggy day image, the visual range of theimage can be effectively improved, and the visual effect is improved.
Description
technical field [0001] The invention relates to an image contrast enhancement method, in particular to an image contrast enhancement method based on histogram limitation, and belongs to the technical field of image processing. Background technique [0002] Image enhancement is one of the basic techniques of image preprocessing, mainly to increase the contrast of the image and highlight useful information; when the histogram of an image is at the low gray end and the dynamic range is relatively small, logarithmic function is usually used for processing; When the image is at the high grayscale end and the dynamic range is relatively small, the antilog function is usually used to process it; for images with a small contrast dynamic range, no matter whether the grayscale histogram is at the high grayscale end or the low grayscale end, the enhancement algorithm will It is necessary to improve the sharpness and contrast of the image very well. Contents of the invention [0003]...
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IPC IPC(8): G06T5/00
CPCG06T5/90
Inventor 王海峰章怡范鑫
Owner JIANGSU UNIV OF TECH